1C4 University Geological Survey of Kansas. 



lunule cordiform, strongly impressed ; ligamental area deeply 

 marked, and extending to the posterior extremity. Anterior 

 and posterior muscular impressions distinct ; hinge strong. 

 Teeth of right valve separated by a deep pit ; the anterior tooth 

 with a longitudinal pit in the summit, and a callosity on the 

 inner margin at its base. Surface marked by strong concentric 

 furrows, which are separated by sharp angular ridges ; the in- 

 termediate space finely striated. " 



Range and distribution : Upper Coal Measures ; Grand Sum- 

 mit. 



CONOCARDIUM. 



Bronn, Leth. Geo., I, p. 92, (1835). 



Conocardium parrishi. Plate XX, fig. 9. 



Conocorclium parrishi Worthen, Geo]. Surv. 111., vni, p. 112, pi. xx, f. 

 7, (1890); Keyes, Geol. Surv. Mo., v, p. 124, pi. xlvi, ff. 6a, b, (1891). 



Worthen's description : " Shell obliquely triangular, hinge 

 line straight, beaks depressed, umbonal ridge elevated into a 

 strong rounded fold, with faint traces of fine striae towards the 

 lower extremity. Anterior side evenly and rapidly sloping 

 from the umbonal fold to the extremity, traversed by radiating 

 costse, only four or five of which extend to the hinge line, but 

 increasing by division and implantation so that ten or more 

 may be counted on the margin of the shell, the one nearest the 

 umbonal ridge being somewhat stronger than the others. Pos- 

 terior side flattened towards the extremity, and marked by 

 eight or more flattened striae, nearly all of which extend to the 

 hinge line. Length, about T 5 - 6 - inch." 



Range and distribution : Upper Coal Measures ; Kansas 



City. 



CYPRICARDINIA. 



Hall, Pal. N. Y., Ill, p. 266, (1860). 



Cypricardinia? carbonaria. Plate XX, fig. 16. 



Cypricardinia? carbonaria Meek, Proc. Acad. Nat. Sci.Phil., p. 163, (1871). 

 Cypricardinia ? carbonaria Meek, Geol. Surv. Ohio, n, Pal., p. 342, 

 pi. xix, ff. 8a, b, (1875). 



Meek's description: "Shell small, longitudinally oval, less 

 than twice as long as high, the widest ( highest ) part being 

 under the posterior extremity of the hinge ; rather gibbous, 

 with usually a broad impression extending from the beaks ob- 



